1 // SPDX-License-Identifier: GPL-2.0-only
3 * arch/arm/mach-iop32x/irq.c
5 * Generic IOP32X IRQ handling functionality
7 * Author: Rory Bolt <rorybolt@pacbell.net>
8 * Copyright (C) 2002 Rory Bolt
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/list.h>
14 #include <asm/mach/irq.h>
16 #include <asm/mach-types.h>
20 static u32 iop32x_mask;
22 static void intctl_write(u32 val)
24 asm volatile("mcr p6, 0, %0, c0, c0, 0" : : "r" (val));
27 static void intstr_write(u32 val)
29 asm volatile("mcr p6, 0, %0, c4, c0, 0" : : "r" (val));
32 static u32 iintsrc_read(void)
36 asm volatile("mrc p6, 0, %0, c8, c0, 0" : "=r" (irq));
42 iop32x_irq_mask(struct irq_data *d)
44 iop32x_mask &= ~(1 << (d->irq - 1));
45 intctl_write(iop32x_mask);
49 iop32x_irq_unmask(struct irq_data *d)
51 iop32x_mask |= 1 << (d->irq - 1);
52 intctl_write(iop32x_mask);
55 struct irq_chip ext_chip = {
57 .irq_ack = iop32x_irq_mask,
58 .irq_mask = iop32x_irq_mask,
59 .irq_unmask = iop32x_irq_unmask,
62 static void iop_handle_irq(struct pt_regs *regs)
69 mask = iintsrc_read();
71 generic_handle_irq(fls(mask));
75 void __init iop32x_init_irq(void)
79 iop_init_cp6_handler();
80 set_handle_irq(iop_handle_irq);
84 if (machine_is_glantank() ||
85 machine_is_iq80321() ||
86 machine_is_iq31244() ||
89 *IOP3XX_PCIIRSR = 0x0f;
91 for (i = 1; i < NR_IRQS; i++) {
92 irq_set_chip_and_handler(i, &ext_chip, handle_level_irq);
93 irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE);